Tool holder



G. H. STAHL.

TooL HOLDER. APPLICATION FILED 06124, 19H). RENEWED NOV. I2, I92I.

YPatented July N, 1922.

A gags/fa GUSTAV H. STAHL, QF

MENOMGNIE, WISCONSIN, ASSIGNOR TO PROGRESS MANUFAG- TUBING- COMIEANY, A GGPARTNERSHP CONSESTING OF GUSTA'V H. STAHL AND RICHARD GUEB/NER, OF EBEE, PENNSYLVANIA. i

. y Toon Hernan.

maaier.

To all w72 om t may concern v lathes and the like, arranged and adapted to improve the quality of work which may be performed thereon. Y Other objects willappear hereinafter.

The invention consists in the-combinations and arrangements of parts hereinafterdescribed and claimed.

The invention will be best understood by reference to the accompanying drawings forming a partof this specification, and in which,

Fig. 1, is a longitudinal section of a tool holder embodying the invention,

Fig. 2, a top plan view of the same,

Fig. 3, a side view of the same,

Fig. a, a transverse section of the same, and

Fig. 5, a perspective view of a stiffening member employed in the tool holder.

The preferred form of construction, as illustrated in the drawings, comprises a tool holding bar 6 having a socket at its forward end for the reception of any usual or desired form or cutting tool 7, and a securing screw 8, as shown. A notch 9 is provided in the bar 6 immediately to the rear of the tool 7 and extending upwardly from the lower edge of said tool well above the same to give resiliency to the connection between the tool socket and the body of the bar. To further increase this resiliency, a spring member 10, in substantially inverted U-shape and channeled to lit the upper end of notch 9 and embrace the sides of the bar 6 is provided, which also serves to stiilen the baragainst lateral deflections or wiggling A stiffening block 11 is loosely inserted in the lower portion of the notch 9, said stiffening block being in eX- aggerated 1`form in horizontal section and provided with flanges embracing the sides of the bar, whereby the vertical resiliency of said bar is not impaired, but lateral deflections or wiggling thereof is prevented. A

Speccation of Letters Patent. Pgmqntd July 1 l, 1922,

, application inea-october 24, uns, senza no. 259,580.

Renewed November 12, 1921l Serial No. 514,827.

yieldable plunger 12 is mounted in the rear of bar 6 to span the notch 9 and bear against the forward wall thereof, block 11 being pro vided with a central opening 13 to permit of the free passage of said plunger. A coiled "spring 1li is imprisoned in the bar 6 to the rear of plunger 12, and an adjusting screw 15 is provided for adjusting the tension of said spring and whereby the resiliency of the construction 1s further augmented and rendered adjustable, as will be readily understood.

In` use, the tool holder is mounted in the tool rest of a lathe or the like, in the usual manner, and various tools 7 mounted therein as desired. Owing to the resilient "character of the tool holder thus provided, nice work, such as the cutting of threads of any size, may be readily and economically done without causing the cutting tool to dig into the work or tear the thread, as is usual with solid tools. Any desired shape or character of tool or cutter may be employed, and a round tool may be used to advantage in cutting square threads, without interfering with the angle. By adjusting the tension of the spring 11i, greater stiffness may be imparted to the tool holder for the roughing of threads or other work, and this tension may be decreased for the finishing operation, thus permitting of doing very fine and accurate work. The specilic form and arrangement of parts is a simple and eiiicient one for the purpose.

While I have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth, but desire to avail myself of such variations and modi fcaticns as come within the scope of the appended claims.

Having described my invention, what I claim as new and desire to secure by Letters Patent is 1. A construction of the class described comprising a holder bar; a tool socket at one end of said bar, there being a notch in said bar to give resiliency thereto; and a springheld plunger in said bar spanning said notch, substantially as described.

2. A construction of the class described comprising a holder bar; a tool socket at one end of said bar, there being a notch in said bar to give resiliency thereto; and a stiffening block loosely inserted in said notch adjacent the open end thereof and slidably engaging opposite sides of said bar, substantially as described.

3. A construction of the class described comprising a holder bar; a tool socket at one end of said bar, there being a notch in said bar to give resiliency thereto; a substantially U-shaped 'spring in said notch permitting yielding of said bar; and a stiflfening member located in said notch adjacent the open end thereof and engaging thesides of said bar, substantially as described.

4. A construction of the classv described` comprising a holder bar; a tool socket at one end of said bar, there being anotch 1n said lbar to give resiliency thereto; a substantially U-shaped spring' in said notch; and a springheld plunger vin said bar spanning said notch, substantially as described.

5- A construction of the class described comprising a holder bar; a tool socket at one end of said bar, there being a notch in said bar to give resiliency thereto ;`a substantially U-shaped spring in said notch; a stiffening member located in said notch and engaging the sides of said bar; and a springheld plunger in said bar spanning' said notch, substantially as described.

6. A construction of the class described comprising a bai having Va tool socket at one end; a notch in said bar immediately beyond said tool socket and extending' from the lower edge thereof upwardly beyondsaid socket;

bracing the sidesl of-said bar; a yieldable plunger mounted in the rear portion of said bar and spanning said notch, there being a central opening" in lsaid stiffening member permitting of the free passage ofsaid plunger; aspring in said bar bearing against 'the rear end of said plunger; and a screw for ad-v justing the tension of said spr1ng,"substan tially as described.

construction of the class described comprising a bar; a tool socket at one end of said bar; a notch in said bar to the rear of said tool socket; and a springheld plunger mounted in the rear of said bar and spanning said notch, substantially asdescribed.

In testimony whereof l have signed my name to this specification in the presence of two subscribing witnesses. p p

Y GUSTAV H. STAHL. Witnesses.:

RICHARD W. GonnNnR,

. DnvnNBAcH. 

